Thermal dehydration of magnesium hydroxide and sintering of nascent magnesium oxide

Hartman, Miloslav; Trnka, O.; Veselý, Václav

doi:10.1002/aic.690400314

Cited by 27 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An average value at practical reaction conditions is -78 kJ/mol. Similar values can be found at [14], [15] and [16]. With a powder density of 0.5 t/m 3 this results in a storage density of about 200 kWh/m 3 , which is about four times the storage density of the sensible water storage.…”

Section: 369supporting

confidence: 79%

“…The equilibrium of the system was discussed in several publications (e.g. [14], [15] and [16]). In this paper the approach by Kato [16] is applied:…”

Section: Thermal Energy Storagementioning

confidence: 99%

“…Reactivity is assumed to be ideal at this conditions, chemical kinetics were neglected in the model. Especially for the hydration (discharging), literature is not conclusive about the reactivity of MgO [15], [16]. Recently, major improvement of the reactivity by doping with alkaline metals was reported [21].…”

Section: Modelling Of the Existing Sitementioning

confidence: 99%

See 2 more Smart Citations

Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Angerer

Djukow

Riedl³

et al. 2018

Journal of Energy Resources Technology

View full text Add to dashboard Cite

In the course of the “Energiewende,” the German electricity market is undergoing major changes. The state-aided priority of renewable generation has led to a significant decline in electricity prices. This reduces the profit margin of cogeneration units and increases the necessity of flexible operation to avoid electricity production when spot prices drop below marginal costs. In this work, a 100 MWel combined-cycle (CC) power plant supplying heat and power to a paper mill is investigated. Currently, the plant is operated heat-controlled and is therefore unable to react to changing electricity spot prices. With the integration of heat storage, the plant is enabled to switch to power-controlled mode. To evaluate the technical impact of the storage, the plant and a thermochemical MgO/Mg(OH)2 storage are modeled using the stationary process simulation tool ebsilon professional. Different operation modes are investigated and results are used to derive a mixed integer linear programming (MILP) model to optimize the operation of the plant/storage system. Using this method, the overall economic impact of the storage on the plant operation is quantified.

show abstract

Section: 369supporting

confidence: 79%

“…The equilibrium of the system was discussed in several publications (e.g. [14], [15] and [16]). In this paper the approach by Kato [16] is applied:…”

Section: Thermal Energy Storagementioning

confidence: 99%

See 1 more Smart Citation

Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Angerer

Djukow

Riedl³

et al. 2018

Journal of Energy Resources Technology

View full text Add to dashboard Cite

show abstract

“…On preliminary runs, the following operating conditions were chosen: the heating rate as slow as 1 deg/min, the sample mass as small as ∼7 mg of 53–74 μm solids, and a dry nitrogen flow of 55 cm 3 /min was maintained around the sample to ward off the gaseous products of reaction and to supply needed heat. In light of commonly accepted practice, − it is believed that such operating conditions ensure that relevant, unbiased experimental kinetic data can be amassed. Also, invariant-temperature measurements were carried out under such conditions.…”

Section: Experimental Sectionmentioning

confidence: 99%

Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids

Hartman

Svoboda

Čech

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

To determine unbiased rates of the decomposition of KHCO 3 , slowly increasing-and constant-temperature TGA methods were employed with small, finely ground samples. Such reaction provides a novel, porous, and highly reactive sorbent for noxious and/or malodorous gases. The bicarbonate commences decomposing at 364 K, and the maximum rate of reaction, attained at 421.9 K, amounts to 5.73 × 10 −4 1/s. Taking advantage of the Schlomilch function, an Arrhenius-type relationship is developed by an integral method: the activation energy is as large as 141.3 kJ/mol and the order of reaction amounts to 1.145. While the pore volume made by calcination (0.2309 cm 3 /g) is not affected by temperature at 403−503 K, the mean pore diameter and the grain size augment with increasing temperature. The diagram presented makes it possible to conveniently predict the conditions to attain near-complete conversion of the bicarbonate and minimize undesirable sintering of the nascent carbonate.

show abstract

“…It is well-known that MgO is sensitive to water and easily hydrated to Mg(OH) 2 by reacting with water, destroying the textural properties, compared with the initial MgO. , In addition, there is a negative effect on the catalytic performance of MgO-supported metal sulfide catalysts, which is due to the formation of a solid solution of a Co(Ni)-MgO or MgMoO 4 compound during catalyst preparation by use of aqueous impregnation. This could result in the loss of the Co (or Ni) promotion effect and the decrease in the number of the formed active phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Co/Mo Ratio on the Morphology and Activity of the CoMo Catalyst Supported on MgO Nanosheets in Dibenzothiophene Hydrodesulfurization

Zhang

Chen

Zheng

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

MgO nanosheets were employed to prepare CoMo catalysts with different Co/Mo ratios (CoMo/NA-MgO) by an aqueous co-impregnation method. CoMo/NA-MgO displayed an increase in the catalytic activity for hydrodesulfurization of dibenzothiophene as the Co/Mo ratio increased in the CoMo catalysts, and it reached maximal activity at the Co/Mo ratio of 0.5. The reaction rate constant (k) and turnover frequency of CoMo/ NA-MgO-0.5 (2.7 × 10 −7 mol g −1 s −1 and 7.9 × 10 −4 s −1 , respectively) were higher than those of conventional CoMo/γ-Al 2 O 3 (2.1 × 10 −7 mol g −1 s −1 and 4.1 × 10 −5 s −1 ). Characterization results revealed that more basic sites on NA-MgO strengthen the interaction between MoO x and NA-MgO, leading to CoMo/NA-MgO with better MoO x dispersion than that of CoMo/γ-Al 2 O 3 . In addition, an increase in Co/Mo for CoMo/NA-MgO weakened the interaction of MoO x with NA-MgO, leading to more MoO x species transformed into a less stacked type II CoMoS phase after sulfidation, improving direct desulfurization activity.

show abstract

Thermal dehydration of magnesium hydroxide and sintering of nascent magnesium oxide

Cited by 27 publications

References 18 publications

Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids

Effect of the Co/Mo Ratio on the Morphology and Activity of the CoMo Catalyst Supported on MgO Nanosheets in Dibenzothiophene Hydrodesulfurization

Contact Info

Product

Resources

About